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Subtract 42/27 from 8/21

1st number: 8/21, 2nd number: 1 15/27

8/21 - 42/27 is -74/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 27 is 189

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 21 × 9 = 189,
    8/21 = 8 × 9/21 × 9 = 72/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    42/27 = 42 × 7/27 × 7 = 294/189
  4. Subtract the two like fractions:
    72/189 - 294/189 = 72 - 294/189 = -222/189
  5. After reducing the fraction, the answer is -74/63

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